Electroacoustic module and electroacoustic communications system

Abstract

The invention specifies an electroacoustic module (100), which has a cap-like housing body (1) with a plate element (10) having a first side (11) and a second side (12) situated opposite the first side (11) and with a sleeve element (13) arranged on the second side (12), has a piezoelectric component (2) which is fastened to the plate element (10) on the second side (12) and is surrounded by the sleeve element (13), and has an electrical connection element (4) on a side of the piezoelectric component (2) facing away from the plate element (10), the piezoelectric component (2) being electrically connected to the electrical connection element, wherein an intermediate space, which is filled with an acoustic decoupling material (5), is formed between at least part of the piezoelectric component (2) and the electrical connection element (4) directly adjacent to the piezoelectric component (2). The invention also specifies an electroacoustic communications system (1000).

Description

[0001] Description

[0002] ELECTRO-ACOUSTIC MODULE AND ELECTRO-ACOUSTIC

[0003] COMMUNICATION CATALOGUE SYSTEM

[0004] An electro-acoustic module and an electro-acoustic communication system are specified.

[0005] Fundamental possibilities for wireless data and energy transmission through metals using piezoelectrically induced acoustic waves are described, for example, in the documents WO 2021 / 052 830 Al, AT 523 707 A4, US 2008 / 0 258 841 Al, US 2019 / 0 112 913 Al, WO 2021 / 197 735 Al, WO 2022 / 101 215 Al, DE 10 2022 129 889 B3 and D. -X. Yang et al., “Through-Metal-Wall Power Delivery and Data Transmission for Enclosed Sensors: A Review", Sensors 2015, 15, 31581-31605, doi: 10. 3390 / sl 51229870 described .

[0006] However, a reliable and user-friendly solution for establishing and maintaining a reliable acoustic channel through metals using pre-assembled modules has not yet been described.

[0007] At least one object of certain embodiments is to specify an electro-acoustic module. At least one further object of certain embodiments is to specify an electro-acoustic communication system.

[0008] These objects are achieved by subject matter according to the independent patent claims. Advantageous embodiments and developments of the subject matter are characterized in the dependent claims and will further emerge from the following description and the drawings.

[0009] According to at least one embodiment, an electro-acoustic module has a housing body and a piezoelectric component. In particular, the housing body can be cap-shaped and have a plate element with a first side and a second side which is opposite the first side. The piezoelectric component can preferably be arranged on the second side of the plate element. In particular, the piezoelectric component can be fastened to the plate element on the second side. The housing body can furthermore have a sleeve element which is particularly preferably cylindrical and is connected to the plate element on the second side, such that the piezoelectric component is surrounded by the sleeve element. The plate element forms in particular the acoustic interface of the electro-acoustic module.In other words, acoustic waves generated by the piezoelectric component are transmitted through the plate element. For this purpose, the plate element can be at least partially designed as a membrane.

[0010] The electro-acoustic module, also referred to as the module in the following, forms a single, inseparable unit during normal operation. A module is therefore referred to here and below as a device that is provided and installed as a single component within the scope of its usual and intended use.

[0011] According to a further embodiment, an electro-acoustic communication system for communication through a wall, i.e. in particular for acoustic data and / or energy transmission through the wall, comprises at least two electro-acoustic modules or at least two piezoelectric components. The electro-acoustic communication system can also be referred to below as a communication system for short or simply as a system and can in particular be intended and configured to transmit data and / or energy at least from a first side of the wall to a second side of the wall. Here and below, the term "wall" generally refers to an acoustically wave-conducting material. The wall can particularly preferably be a metal wall. Furthermore, other materials for the wall are also possible which have sufficient structure and strength to conduct acoustic waves.The wall can, in particular, be part of a customer's application, for example, a tank, and be present independently of the module and communication system. The electro-acoustic module and the electro-acoustic communication system are therefore preferably designed to allow easy integration into the customer application.

[0012] The features and embodiments described above and below apply equally to the electroacoustic module and the electroacoustic communication system. In particular, the features and embodiments described for an electroacoustic module can apply to all electroacoustic modules of the communication system, wherein the electroacoustic modules of the communication system can be designed the same or differently within the scope of the described embodiments and features depending on the application and required functionality. A piezoelectric component used for the electroacoustic module and for the electroacoustic communication system is provided and designed in particular for converting an electrical voltage signal, for example a carrier frequency, into an acoustic wave, particularly preferably with the same signal shape, and vice versa.The piezoelectric component can thus convert an electrical voltage signal into an acoustic wave and emit this, and conversely, convert an acoustic wave incident on the piezoelectric component from outside into an electrical voltage. The piezoelectric component is therefore an electro-acoustic transducer. The piezoelectric component can preferably comprise a lead-free material. Alternatively, the piezoelectric component can also comprise PZT (lead zirconate titanate), for example. The piezoelectric component is particularly preferably designed in the form of a circular or polygonal disk which is applied to the plate element of the housing body.In particular, a height of the piezoelectric component along the arrangement direction of the piezoelectric component on the package body is smaller than a width or a diameter of the piezoelectric component in a direction perpendicular to the arrangement direction.

[0013] Furthermore, the piezoelectric component can have electrode layers, for example on at least two regions and preferably on two sides, for example on two opposite sides, which are provided and configured for the electrical connection of the piezoelectric component. The piezoelectric component can particularly preferably be designed as a disk with a bottom side facing the plate element of the housing body and an top side facing away from the plate element and opposite the bottom side, with a first electrode layer being applied to the top side and a second electrode layer being applied to the bottom side. The second electrode layer can extend over a side edge of the disk onto the top side, so that electrical contact with the piezoelectric component is only possible from the top side.

[0014] During operation of the communication system, an acoustic wave generated by a piezoelectric component can be detected, for example, through the wall by another piezoelectric component of the communication system, with the acoustic wave in this case being conducted through the wall. The communication system thus forms a system that can also be referred to as an ADL (acoustic data link). Unidirectional or bidirectional communication can be possible. In unidirectional operation, one of the piezoelectric components acts as a transmitter, emitting acoustic waves, while the other of the piezoelectric components acts as a receiver, detecting the acoustic waves. The communication system can, for example, enable energy to be transmitted through the wall.Furthermore, data can be transmitted to the receiving piezoelectric component, for example. In bidirectional operation, the role of the transmitting and receiving piezoelectric component can alternate.

[0015] For example, a first-receiving piezoelectric component can, after detecting corresponding acoustic waves intended for energy transmission and / or representing suitable control signals, generate acoustic waves in response, which are received by the first-transmitting piezoelectric component. For example, data can be queried once or continuously through a wall. Depending on the respective functionality, a module or at least one piezoelectric component can also be referred to as a transceiver, transponder, or reader.

[0016] According to a further embodiment, an electrical connection element is provided, to which the piezoelectric component is electrically connected. In particular, the electrical connection element can be arranged on a side of the piezoelectric component facing away from the plate element, i.e. the previously described top side of the piezoelectric component. An intermediate space can be formed directly adjacent to the piezoelectric component between at least part of the piezoelectric component and the electrical connection element. The intermediate space is filled with an acoustic decoupling material. The acoustic decoupling material preferably has a low acoustic coupling to the piezoelectric component, at least in comparison to the plate element of the housing body, so that sound waves generated by the piezoelectric component during operation are not transmitted or are transmitted to a significantly lesser extent than the plate element.For example, the acoustic decoupling material can be a gel or, preferably, a gas. In particular, the gas can be air, so that an air gap is formed behind the piezoelectric component, as seen from the plate element.

[0017] For example, the piezoelectric component can be electrically connected to electrical contacts of the electrical connection element. The piezoelectric component can be directly attached to the electrical contacts, for example, by soldering, or the piezoelectric component can be electrically connected to the electrical contacts by means of contact wires. The electrical connection element can, in particular, comprise or be a printed circuit board. The electrical connection element can have a recess in which the acoustic decoupling material is at least partially arranged.Alternatively or additionally, the electrical connection element can have raised electrical contacts to which the piezoelectric component is attached, so that the piezoelectric component is spaced from the electrical connection element in a region between the electrical contacts, whereby the intermediate space with the acoustic decoupling material is formed.

[0018] According to a further embodiment, an acoustic absorber element is arranged adjacent to the acoustic decoupling material. The acoustic absorber element can particularly preferably be arranged on the electrical connection element and furthermore be fastened thereto. The acoustic absorber element can comprise or be a porous material and thus be foam-like or sponge-like. The acoustic absorber element can thus preferably comprise cavities, for example in the form of bubbles, which preferably have a size in the range of millimeters, for example 1 mm, or less. For example, the acoustic absorber element can be a foam element.The acoustic absorber element can prevent or at least reduce the back reflection of sound waves from the electrical connection element to the piezoelectric component, so that the detection of sound waves transmitted from the plate element to the piezoelectric component can be improved.

[0019] According to a further embodiment, the piezoelectric component is attached to the plate element by means of a connecting layer, in particular by means of an adhesive. In order to achieve a good acoustic connection of the piezoelectric component to the plate element and thus to the acoustic interface, an epoxy resin-based adhesive or another adhesive which is not or only slightly elastic in the cured state can be used. In particular, the piezoelectric component can be attached directly to the plate element by the connecting layer, so that a good mechanical coupling between the plate element and the piezoelectric component can be achieved. Furthermore, the piezoelectric component and the electrical connection element can be attached to the housing body independently of one another.This allows acoustic decoupling of the piezoelectric component from the electrical connection element to be achieved.

[0020] The electrical connection element can comprise one or more electrical components and / or a contact plug. The one or more electrical components can, for example, be provided for controlling the piezoelectric component and / or comprise one or more sensors. Furthermore, it may also be possible to connect a power supply and / or one or more sensors or at least part of a control electronics system via the contact plug. Particularly preferably, the desired functionality of the electro-acoustic module can be enabled by the electrical connection element and the electrical components.

[0021] For example, the communication system can have a first and a second electro-acoustic module, the first electro-acoustic module being attached to a first side of the wall and the second electro-acoustic module being attached to a second side of the wall opposite the first side. In this case, the electro-acoustic modules of the communication system can be of identical design. In other words, in this case, identical modules are used on both sides of the wall, so that the modules can be used as a universal component on either side of the wall and the communication system can thus have a simple and cost-effective design.Alternatively, differently designed electro-acoustic modules can be used on both sides of the wall, which can be optimized with regard to the respective requirements placed on them in order to achieve, for example, a particularly efficient transmission of data and / or energy.

[0022] According to a further embodiment, the communication system has measures that enable simple and reliable alignment of the electro-acoustic modules to one another on the two sides of the wall. For example, the communication system can have a first holding element on the first side and a second holding element on the second side of the wall. The first electro-acoustic module is preferably fastened to the first holding element that is firmly connected to the wall. The second electro-acoustic module is preferably fastened to the second holding element that is firmly connected to the wall. The first holding element can be fastened to the wall, for example, by welding or gluing. Furthermore, the second holding element can be fastened to the wall, for example, by welding or gluing. Alternatively, at least the first holding element or the second holding element or both holding elements can be fastened to the wall by means of screws.Furthermore, the first and / or second retaining element can be formed in the wall and thus be part of the wall. The fastening and / or formation of the retaining elements on or in the wall can already take place during the manufacture of the application to which the wall belongs, for example, a tank.

[0023] The first holding element and the second holding element are in particular aligned with each other such that after the electro-acoustic modules have been fastened to the holding elements, the electro-acoustic modules are also aligned with each other.

[0024] Each of the holding elements can have an insertion area into which an electro-acoustic module can be inserted. By fixing the electro-acoustic module in the insertion area, the electro-acoustic module can be permanently fastened to the holding element. For example, the first holding element and the second holding element can each be annular. In other words, each of the holding elements can have a ring or be designed as a ring. Such a ring can, for example, be fastened to the surface of the wall or be integrally formed in the surface of the wall. Furthermore, the first and second holding elements can, for example, be designed as a bore in the wall or have at least one bore. The holding elements can be aligned concentrically to one another.In other words, each of the holding elements can have a center point of the insertion region, wherein the center points of the first and second holding elements are preferably located opposite one another along a direction perpendicular to the surface of the wall and are thus arranged congruently with one another on the first and second sides of the wall. This can mean, in particular, that an imaginary connecting line from the center point of the first holding element to the center point of the second holding element is perpendicular to the wall. After the electro-acoustic modules have been inserted into the insertion regions of the holding elements, the acoustic interfaces of the electro-acoustic modules are thus also aligned concentrically with one another.As a result of the holding elements being aligned with one another, the electro-acoustic modules and in particular the piezoelectric components of these are aligned with one another in such a way that they are opposite one another, whereby an optimized transmission of sound waves and thus of data and / or energy from one piezoelectric component to the other piezoelectric component can be achieved.

[0025] The first electro-acoustic module can have a guide region complementary to the insertion region of the first holding element, so that the first electro-acoustic module can be arranged in a predetermined manner and in a predetermined position on the first holding element. In particular, the sleeve region of the housing body of the first electro-acoustic module can have such a guide region on the outer side facing away from the piezoelectric component. The insertion region of the first holding element and the guide region of the first electro-acoustic module can, for example, have surface structures complementary to one another which enable a positive and / or non-positive arrangement on one another. For example, the insertion region of the first holding element and the guide region of the first electro-acoustic module can have webs and grooves or complementary threads complementary to one another.In other words, the sleeve element of the housing body of the first electro-acoustic module can have one or more webs on the outside which can be inserted into grooves in the insertion region of the first holding element or vice versa. The sleeve element of the housing body of the first electro-acoustic module particularly preferably has a thread on the outside with which the first electro-acoustic module can be screwed into a corresponding thread in the insertion region of the first holding element. Alternatively or additionally, the first electro-acoustic module can be fastened to the first holding element, for example after it has been inserted into the first holding element, by means of a clamp. The clamping can be effected by means of an additional element or also by means of a press fit.The features and embodiments described for the first electro-acoustic module and the first holding element can equally apply to the second electro-acoustic module and the second holding element.

[0026] According to a further embodiment, an acoustic coupling medium is arranged between the first electro-acoustic module, in particular the acoustic interface of the first electro-acoustic module, and the wall. Correspondingly, an acoustic coupling medium is preferably arranged between the second electro-acoustic module, in particular the acoustic interface of the second electro-acoustic module, and the wall. The acoustic coupling medium can be arranged in particular in the insertion region of the holding elements on the wall and improve the transmission of sound waves between the electro-acoustic modules and the wall. The acoustic coupling medium can, for example, be a resin, a gel or another material that conducts sound waves well and can, for example, comprise or be a plastic.

[0027] Furthermore, the first electro-acoustic module together with the first holding element and / or the second electro-acoustic module together with the second holding element can be covered with a potting compound. The potting compound can, in particular, comprise or be made of a plastic material. For example, if present, only a portion of a contact plug of a module can protrude from the potting compound.

[0028] According to a further embodiment, the electroacoustic communication system comprises a cap-like housing body with a plate element having a first side and a second side opposite the first side, and with a sleeve element arranged on the second side. The housing body of the communication system can have features that were previously described in connection with the housing body of the electroacoustic module. In particular, the housing body of the communication system can be a common housing body for two piezoelectric components.

[0029] According to a further embodiment, a first piezoelectric component is fastened to the plate element on the first side, and a second piezoelectric component is fastened to the plate element on the second side and surrounded by the sleeve element. The first piezoelectric component and the second piezoelectric component are aligned with one another. Analogous to the description in connection with the modules, this can mean in particular that the first piezoelectric component has a center point which is arranged overlapping and congruent with the center point of the second piezoelectric component, so that the piezoelectric components are preferably arranged overlapping and congruent on the plate element of the common housing body. On the first side, a recess in which the first piezoelectric component is arranged can be provided in the plate element.This allows a better acoustic coupling of the first piezoelectric component to the plate element to be achieved.

[0030] Furthermore, each of the first and second piezoelectric components can be connected to a respective electrical connection element. The electrical connection elements as well as further features, for example relating to the acoustic decoupling material and the acoustic absorber material, can be present, arranged, and formed behind the respective piezoelectric component, as viewed from the plate element, as described above.

[0031] The communication system with the first and second piezoelectric components can be provided and configured, in particular, for insertion and fastening into an opening in a wall. Particularly preferably, the sleeve element of the common housing body can have a thread for screwing into a threaded hole in the wall. This can make it possible to eliminate the need to mount two modules on two sides of a wall. Rather, it is sufficient if a through-hole is provided in the wall, into which the sleeve element of the common housing body is inserted.

[0032] As described above, depending on the design of the communications system, a first electro-acoustic module can be attached to, for example, the inside of a wall and acoustically coupled, while another electro-acoustic module is attached to the outside of the wall, ideally opposite the first module, and acoustically coupled. Conventional electronic components can be connected inside and out in a simple manner using the modules' electrical connection elements. The electro-acoustic modules convert the signals into acoustic waves that can penetrate the wall. In addition to using suitable piezoelectric components, the modules can also use suitable signals and protocols to ensure good transmission through the wall.Each of the modules can be operated analogously, i.e. with direct contact between a connected electronic component and the piezoelectric device, or digitally, i.e. with contact between a connected electronic component and a semiconductor chip arranged in the housing body, for example on the electrical connection element, which can, for example, receive signals and protocols as electrical signals from the piezoelectric device or provide them for it. Each of the modules can therefore, for example, function with an NFC protocol and corresponding signals and can have, for example, a universal ID number and / or energy harvesting for a regulated supply voltage and a test of the current capacity of the channel and / or a digital I. 2C interface with master function and / or memory management with fixed and / or volatile memory and / or encryption. Furthermore, as described above, the communication system can have a common housing body with two piezoelectric components instead of two electro-acoustic modules with their own housing bodies. This housing body can be provided to a user completely assembled, so that the user only has to insert the communication system into a wall opening and secure it. The above description applies analogously to this version of the communication system.

[0033] The electro-acoustic module and the electro-acoustic communication system described here particularly preferably include and / or enable acoustic alignment and effective coupling of piezoelectric elements, materials for acoustic coupling, impedance matching of the piezoelectric elements that function as transceivers, as well as housings and seals of the piezoelectric elements with or without necessary electronics in such a way that a user can easily use them in various applications. Furthermore, the module and / or the communication system can preferably include complete reader and transponder modules as well as sensor interfaces and / or connectors for connecting to standard electronics for data transmission.In particular, a so-called "application kit" can be created that contains all the necessary components for communication, i.e., depending on the design, one or more modules, brackets, coupling materials, electronics, and instructions for various scenarios, which, together with coordinated material and acoustic parameters, are designed and coordinated as perfectly as possible to provide customers with a simple, ready-to-use plug-and-play solution for their applications. Handling can particularly preferably be so simple that the communication system can be screwed into a standard screw hole as a module kit and switched on.

[0034] Further advantages, advantageous embodiments and further developments emerge from the exemplary embodiments described below in conjunction with the figures.

[0035] Figure 1 shows a schematic representation of an electro-acoustic module according to an embodiment,

[0036] Figure 2 shows a schematic representation of an electro-acoustic module according to a further embodiment,

[0037] Figure 3 shows a schematic representation of an electro-acoustic communication system according to a further embodiment,

[0038] Figures 4 and 5 show schematic representations of part of a communication system according to further embodiments,

[0039] Figures 6A and 6B show schematic representations of an electro-acoustic module according to a further embodiment,

[0040] Figures 7 to 8B show schematic representations of an electro-acoustic module according to further embodiments,

[0041] Figures 9A to 10 show schematic representations of an electro-acoustic module and a

[0042] Communication system according to further

[0043] From examples and Figure 11 shows a schematic representation of an electro-acoustic communication system according to another

[0044] From example .

[0045] In the exemplary embodiments and figures, identical, similar, or similarly acting elements may be provided with the same reference numerals. The illustrated elements and their relative sizes are not to be considered true to scale; rather, individual elements, such as layers, components, structural elements, and regions, may be exaggerated for clarity and / or clarity.

[0046] Figure 1 shows an electro-acoustic module 100 according to an exemplary embodiment. The electro-acoustic module 100, hereinafter also referred to as module 100 for short, has a housing body 1 and a piezoelectric component 2. In the exemplary embodiment shown, the housing body 1 is cap-shaped and has a plate element 10 with a first side 11 and a second side 12, which is opposite the first side 11. The piezoelectric component 2 is arranged on the second side 12 of the plate element 10 and is thus located in the interior of the housing body 1.

[0047] The piezoelectric component 2 is provided and designed to convert an electrical voltage signal, for example a carrier frequency, into an acoustic wave, particularly preferably with the same signal form, and vice versa. The piezoelectric component 2 can thus convert an electrical voltage signal into an acoustic wave, which can then be transmitted from the piezoelectric component 2 to the plate element 10 and emitted by the latter. Furthermore, the piezoelectric component 2 can conversely convert an acoustic wave incident on the plate element 10 from the outside, which is transmitted to the piezoelectric component 2, back into an electrical voltage. The piezoelectric component 2 is thus an electro-acoustic transducer. The plate element 10 forms the acoustic interface of the electro-acoustic module 100.

[0048] The piezoelectric component 2 can preferably comprise a lead-free material. Alternatively, the piezoelectric component 2 can also comprise PZT (lead zirconate titanate), for example. The piezoelectric component 2 is particularly preferably designed in the form of a circular or polygonal disk that is applied to the plate element 10 of the housing body 1. In particular, a height of the piezoelectric component 2 along the arrangement direction of the piezoelectric component 2 on the plate element 10 of the housing body 1 is less than a width or a diameter of the piezoelectric component 2 in a direction perpendicular to the arrangement direction.Furthermore, the piezoelectric component 2 can, for example, have electrode layers (not shown) on at least two areas and preferably on two sides, for example on two opposite sides, which are provided and configured for the electrical connection of the piezoelectric component 2. Particularly preferably, the piezoelectric component 2 can be designed as a disk with an underside facing the plate element 10 of the housing body 1 and an upper side facing away from the plate element 10 and opposite the underside, wherein a first electrode layer is applied to the upper side and a second electrode layer is applied to the underside. The second electrode layer can extend over a side edge of the disk onto the upper side, so that electrical contact with the piezoelectric component 2 is only possible from the upper side.

[0049] The piezoelectric component 2 is fastened to the plate element 10 on the second side 12. For this purpose, the module 100 has a connecting layer 3 with or made of an adhesive, by means of which the piezoelectric component 2 is fastened to the plate element 10. In order to achieve a good acoustic connection of the piezoelectric component 2 to the plate element 10 and thus to the acoustic interface, an epoxy resin-based adhesive or another adhesive which is not or only slightly elastic in the cured state can be used. Furthermore, as indicated in Figure 1, the plate element 10 can have a smaller thickness in the area on the second side 12 in which the piezoelectric component 2 is arranged and fastened than in surrounding areas and can therefore be designed as a membrane at least in this area in order to enable efficient transmission of sound waves.For this purpose, a recess can be provided on the second side 12 of the plate element 10, in which the piezoelectric component 2 with the connecting layer 3 is arranged.

[0050] Furthermore, an electrical connection element 4 is provided, to which the piezoelectric component 2 is electrically connected. For this purpose, the electrical connection element 4 is arranged on a side of the piezoelectric component 2 facing away from the plate element 10 and thus on the upper side of the piezoelectric component 2. Between at least a part of the piezoelectric component 2 and the electrical connection element 4, directly adjacent to the piezoelectric component 2, an intermediate space is formed which is filled with an acoustic decoupling material 5. The acoustic decoupling material 5 preferably has a low acoustic coupling to the piezoelectric component 2, at least in comparison to the plate element 10 of the housing body 1, so that sound waves generated by the piezoelectric component 2 during operation are not transmitted or are transmitted to a significantly lesser extent than in the plate element 10.For example, the acoustic decoupling material 5 can be a gel or, preferably, a gas. In particular, the gas can be air, so that, viewed from the acoustic interface, an air gap is formed behind the piezoelectric component 2 by the decoupling material 5. The gap with the acoustic decoupling material 5 preferably has a height of greater than or equal to 100 pm, and preferably greater than or equal to 200 pm.

[0051] For example, the piezoelectric component 2 can be fastened to electrical contacts 40 of the electrical connection element 4 and electrically connected. The electrical connection element 4 can in particular have or be a printed circuit board. The electrical connection element 4 can have a recess 42, as indicated in Figure 1, in which the acoustic decoupling material 5 is at least partially arranged. Alternatively or additionally, the electrical connection element 4 can have raised electrical contacts 41, as also indicated in Figure 1, to which the piezoelectric component 2 is fastened, so that the piezoelectric component 2 is spaced apart from the electrical connection element 4 in a region between the electrical contacts 41, whereby the intermediate space 42 with the acoustic decoupling material 5 is formed.

[0052] Particularly preferably, the piezoelectric component 2 and the electrical connection element 4 are fastened independently of one another on or in the housing body 1. For example, the housing body 1 can have a stepped support region (not shown) on which the electrical connection element 4 rests and to which the electrical connection element 4 can be fastened, for example by means of an adhesive. This can at least partially achieve acoustic decoupling of the piezoelectric component 2 from the electrical connection element 4.

[0053] The electrical connection element 4 can further comprise one or more electrical components 43 and / or a contact plug 44. The one or more electrical components can, for example, be provided for controlling the piezoelectric component 2 and / or can also comprise one or more sensors. Furthermore, it can also be possible to connect a power supply and / or one or more sensors or at least part of a control electronics via the contact plug 44. Depending on the design and assembly of the electrical connection element 4, the module 100 can be designed as a simple reader, i.e. as a receiving module, or as a transponder, i.e. in particular with transmitting and receiving functions.

[0054] The piezoelectric component 2 and the electrical

[0055] Connection element 4 are as indicated in Figure 1 in a

[0056] The contact plug 44 is arranged in a recess of the housing body 1 and is preferably encapsulated with a potting compound 6, for example with or made of a plastic material, whereby the elements arranged in the housing body 1 can be protected. The contact plug 44 or a sensor can protrude from the potting compound 6 or be arranged outside the potting compound 6.

[0057] The housing body 1 further comprises a sleeve element 13, which is particularly preferably cylindrical and is connected to the plate element 10 on its second side 12, so that the previously described recess is formed in the housing body 1, in which recess the piezoelectric component 2 and the electrical connection element 4 are arranged. The piezoelectric component 2 and also the electrical connection element 4 are thus surrounded by the sleeve element 13. The plate element 10 and the sleeve element 13 are particularly preferably formed in one piece. The housing body 1 can preferably be made with or from a metal, for example aluminum.

[0058] As explained further below, the module 100 can be inserted into a holding element on a wall with the plate element 10 and the sleeve element 13. For example, the sleeve element 13 can have a thread 14 on an outer side facing away from the piezoelectric component 2, with which the module 100 can be screwed into a holding element. Alternatively, a simple plug-in installation, for example in conjunction with a clamping fixture, may also be possible.

[0059] As shown in a further exemplary embodiment in Figure 2, the module 100 can further comprise an acoustic absorber element 7. The acoustic absorber element 7 is particularly preferably arranged adjacent to the acoustic decoupling material 5. In particular, the acoustic absorber element 7 can be arranged on the electrical connection element 4 and, for example, be fastened to it, for example by an adhesive connection. The acoustic absorber element 7 can preferably comprise or be a porous material and can therefore be foam-like or sponge-like. The acoustic absorber element 7 can thus preferably have cavities, for example in the form of bubbles, which preferably have a size in the range of millimeters, for example less than or equal to 1 mm, and can, for example, be formed by a foam element.By means of the acoustic absorber element 7, a back reflection of sound waves from the electrical connection element 4 to the piezoelectric component 2 can be prevented or at least reduced, so that a detection of sound waves which are guided to the piezoelectric component 2 via the acoustic interface can be improved.

[0060] Figure 3 shows an electro-acoustic communication system 1000, also simply referred to as communication system 1000, which has two electro-acoustic modules 100, which can be the same or different and can be designed, for example, according to one of the previous exemplary embodiments or also according to the exemplary embodiments described below. The communication system 1000 is provided and configured for communication through a wall 200, that is to say in particular for acoustic data and / or energy transmission through the wall 200. The wall 200 can particularly preferably be a metal wall, for example of a tank, which is part of an application of a customer who wishes to integrate and use the communication system 1000 in the application.During operation, an acoustic wave generated by the piezoelectric component of one of the modules 100 can be detected through the wall 200 by the piezoelectric component of the other module 100, the acoustic wave being conducted through the wall 200. The communication system 1000 thus forms an ADL system with unidirectional or bidirectional communication. In unidirectional operation, one of the piezoelectric components of the modules 100 acts as a transmitter, emitting acoustic waves, while the other of the piezoelectric components of the modules 100 acts as a receiver, detecting the acoustic waves. This may, for example, enable energy to be transferred through the wall 200. Furthermore, data may, for example, be transmitted to the receiving piezoelectric component.In bidirectional operation, the role of the transmitting and receiving piezoelectric component, and thus of the transmitting and receiving module 100, can alternate. For example, a piezoelectric component that receives first can, after detecting corresponding acoustic waves intended for energy transmission and / or that represent suitable control signals, generate acoustic waves itself in response, which are received by the piezoelectric component that transmits first. For example, data can be queried once or continuously through a wall 200.

[0061] In order to enable simple and reliable alignment of the electro-acoustic modules 100 to one another on the two sides of the wall 200, the communication system 1000 has a first holding element 300 on one side and a second holding element 300 on the other side of the wall. The holding elements 300 are formed as integral components in the wall 200 or, for example due to easier manufacture, are preferably fastened to the wall 200. The holding elements 300 can be fastened to the wall 200, for example by means of gluing, welding or screwing. One of the electro-acoustic modules 100 is fastened to the first holding element 300 which is firmly connected to the wall 200. The other of the electro-acoustic modules 100 is fastened to the second holding element 300 which is firmly connected to the wall 200.The fastening of the holding elements 300 to the wall 200 can already take place during the manufacture of the object to which the wall 200 belongs, for example, a tank. The modules 100 can be fastened in the holding elements 300, for example, by screwing, clicking, clamping, and / or gluing.

[0062] The first and second holding elements 300 are, in particular, aligned with one another such that, after the electro-acoustic modules 100 are attached to the holding elements 300, the electro-acoustic modules 100 are also aligned with one another. For example, the holding elements 300 can be aligned concentrically with one another, as described above in the general section.

[0063] In order to enable good acoustic coupling of the modules 100 to the wall 200, an acoustic coupling medium 400 is arranged between each of the electro-acoustic modules 100, in particular the acoustic interfaces of the modules 100, and the wall 200. The acoustic coupling medium 400 can be arranged in particular in the insertion region of the holding elements 300 on the wall and improve the transmission of sound waves between the electro-acoustic modules 100 and the wall 200. The acoustic coupling medium 400 can, for example, be liquid, soft or hard and have good acoustic coupling properties between the surfaces of the modules 100 and the wall 200. For example, the coupling medium 400 can have or be an adhesive, a gel, acoustic coupling polymers or the like.

[0064] The communication system 1000 for communication through the wall 200 of an application such as a tank thus has two ADL link modules in the form of the electro-acoustic modules 100, each with at least some internal components. The modules 100 can be precisely mounted by the holders 300, which can be, for example, fastening sockets and which can be formed in the wall 200 or fastened to the wall 200. Acoustic waves are guided from one side to the other through the wall 200. An efficient acoustic connection of the modules 100 to the wall 200 can be achieved by the acoustic coupling medium 400.

[0065] As shown in Figure 4 in a section of the communication system 1000, the holders 300 for the modules 100 can preferably be ring-shaped. In the exemplary embodiment shown, each of the holding elements 300 has a ring or is preferably designed as a ring which has an insertion region into which the respective module 100 can be inserted and fixed. In the exemplary embodiment shown, the holding element 300 shown is fastened to the wall 200 by means of a connecting element 500, which can be an adhesive or a weld, for example. The holding elements 300 are in particular aligned concentrically to one another, as described above in the general part. After the modules 100 have been inserted into the insertion regions of the holding elements 300, the acoustic interfaces of the electro-acoustic modules 100 are therefore also aligned concentrically to one another.

[0066] As described above, the respective sleeve element 13 of the modules 100 can have a thread 14 that can be screwed into a thread 301 of the respective holding element 300. Alternatively, other complementary surface structures in the modules 100 and the holding elements 300 are also possible, which can enable a positive and / or non-positive connection. Furthermore, it may also be possible for a module 100 to be simply inserted into a holding element 300 and secured, for example, by a clamping mechanism such as a press fit.

[0067] As an alternative to holding elements 300 that are formed or arranged in a raised manner on the wall 200, holding elements in the form of blind holes can be provided in the wall 200, for example, into which the modules 100 can be inserted, clamped or screwed, as in the shown holding elements 300 that are formed or arranged in a raised manner.

[0068] If necessary, for example to improve the fixation of a module 100 to the holding element 300, a fixing element 600, for example in the form of an adhesive, a sealing ring or a snap ring, can be provided, as indicated in Figure 4. This can also prevent leakage of a liquid coupling medium 400, in particular when using this. Furthermore, the modules 100 together with the respective holding element 300 can be covered with a potting compound 700, as indicated in a further exemplary embodiment in Figure 5. The potting compound 700 can in particular comprise or be a plastic material.

[0069] The manufacture of the communication system 1000 may in particular comprise one or more of the following steps and features. Depending on the type of insertion, for example screwing, pressing or pushing in, a thin gap, in particular greater than or equal to 50 μm and less than or equal to 200 μm, should remain between the wall 200 and the acoustic interface of a module 100, in which gap the coupling medium 400 is arranged in order to fill the gap and reduce the air gap between the two solid surfaces as much as possible. This material is selected to meet the requirements of the application and to ensure good performance stability over the lifetime of the application and for the operating conditions.After inserting the module 100 into a holding element 300, a blocking mechanism, for example by means of a fixing element 600 or a mechanical stop, can allow the entire assembly to be stabilized in a fixed state to ensure long-term stable operation. It is also possible to consider maintenance work, which may consist of renewing the coupling medium 400 to cover the long lifetime of the application or replacing one or more parts. During the insertion of a module 100 into a holding element 300, the blocking mechanism allows the insertion to be limited to avoid the surface of the acoustic interface of the module 100 and the wall surface of the application being pressed against each other, thus preventing damage to the connection and uneven acoustic coupling.In the case of a liquid or gel-like coupling medium 400, a chamber with compressible components can be used to collect overflowing coupling medium 400.

[0070] A kit for a communication system 1000 may comprise one or more of the following elements: One or two electro-acoustic modules 100 with or without embedded electronics for fulfilling a specific functionality, for example Unique ID, sensor module, transceiver module, reader module. One or two holding elements 300 for the case of mounting on the surface of the wall 200, for gluing, welding or screwing to or into the surface of the wall of the application. A coupling medium 400 for the mounting and impedance matching between module(s) 100 and wall 200 of the application. The coupling medium 400 may be part of a module 100, may be supplied separately or may be recommended as part of an application note.

[0071] Furthermore, guidelines for preparing the surface of the wall 200 may be provided, for example. These may include, for example, factors such as roughness, consideration of composite materials, anodized surfaces, etc. for surface mounting, or steps for preparing a receiving cavity for mounting in a recess or interior space.

[0072] For the assembly and installation steps of a module 100, one or more of the following features and elements may be advantageous: Marking of mounting points to enable good alignment, where less than 2 mm spatial offset including axis tilt is desired. Preparation of the mounting points by drilling and optionally adding screw threads and / or attaching holding elements 300 by gluing, welding or screwing. Machining of the surface to be used for acoustic coupling to provide low roughness. Cleaning the areas where an electro-acoustic module 100 is to be mounted. Preparing a module 100 for installation, for example removing packaging and protective elements and adding coupling medium 400 if not already present on the module 100. Inserting the module 100 into the area provided for it according to the installation guidelines.Secure the installed module 100. Test the connection performance. If necessary, pour over or cover the installed module 100 to protect it.

[0073] Further embodiments are described below, which are modifications of the previously described embodiments. The following description therefore primarily refers to differences from previous embodiments. Elements and features not described or not provided with reference symbols may be implemented as in the respective previously described embodiments.

[0074] Figures 6A and 6B show a further exemplary embodiment of a module 100 in a sectional view and an exploded view. In comparison to the previous exemplary embodiments, the housing body 1 is designed in several parts and has a plate element 10 in the form of a membrane, which is fastened to the sleeve element 13 with a thread 14 by means of a connecting layer 18, for example an adhesive. The sleeve element 13 also has openings 15 for the engagement of a tool for screwing the module 100, for example into a holding element. Furthermore, the piezoelectric component 2 is fastened to the electrical connection element 4 by means of an annular connecting layer 8, such as an adhesive.

[0075] Figure 7 shows a further exemplary embodiment of a module 100 in a partially cut-away three-dimensional view, which has a housing body 1 in which the sleeve element 13 extends beyond the plate element 10 and an opening 15 for an assembly tool, for example an Allen key, is provided on the side of the plate element 10 facing away from the piezoelectric component 2. The module 100 shown can, for example, be designed as a so-called unique ID transponder module. This module can be used for unique identification, for example of assets, which can be used with advanced authentication techniques of NFC technology (NEC: "near-field communication"). The module 100 can, for example, be used to verify the authenticity of high-end metal devices in various areas.

[0076] In Figures 8A and 8B, a further exemplary embodiment of a module 100, which, in comparison to the previous exemplary embodiment, does not have a thread on the sleeve element 13, is shown in a partially sectioned three-dimensional view alone and mounted in a holding element 300 designed as an opening in a wall 200. The module 100 shown, which can also be designed as a unique ID transponder module, for example, can be integrated into the wall 200 by means of a press fit.

[0077] Holding element 300 must be mounted.

[0078] Figure 9A shows a further exemplary embodiment of a module 100 together with a tool 2000 for assembly. Figure 9B shows a further exemplary embodiment of a communication system 1000 with such modules 100. The tool 2000 can engage from the rear side into the sleeve element 13 with the thread 14 on the outside, so that the module 100 can be easily mounted on a holding element 300 on the wall 200.

[0079] To manufacture and assemble the module 100, a housing body 1, in particular made of or made of aluminum, can be provided, into which the piezoelectric component 2 is glued to the plate element 10. The acoustic decoupling element 5 can be mounted on the electrical connection element 4 before assembly in the housing body 1, for example by gluing. The piezoelectric component 2 can be electrically connected by soldered wire connections. After inserting the connection element 4 with the decoupling element 5, a potting compound (not shown) can be filled into the housing body 1. In Figure 9A, in contrast to Figure 9B, no contact plug 44 is shown.

[0080] The module 100 shown can have the following features in particular: The tool 2000 can be used for screwing in from the side facing away from the acoustic interface. The module 100 has a metallic encapsulation with the membrane formed by the plate element 10, with the thread 14 on the outside of the sleeve element 13 and, as can be seen in Figure 9A, with compartments for the internal components offset by steps. The piezoelectric component 2 is glued to the inside of the plate element 10 designed as a membrane and is connected to the electrical connection element 4 either via wires or conductor tracks. Behind the piezoelectric component 2, i.e. on the side facing away from the acoustic interface, there is an air gap in order to force the acoustic wave into the metal on the side of the acoustic interface.An acoustic wave damping material in the form of an acoustic decoupling material 5 is present to prevent back reflections from the electrical connection element 4. The electrical connection element 4 can, in a minimal version, contain only a contact plug, and in an extended version, additional electronics in the form of electrical components to fulfill the transponder function or even the entire application-specific transponder including the required sensors.

[0081] In the exemplary embodiment of the communication system 1000 shown in Figure 10, in comparison to the exemplary embodiment of Figure 9B, the holding elements 300 are fastened to the wall 200 by means of screws 800. Alternatively or additionally, an adhesive connection may also be possible, for example. Furthermore, it may also be possible to form the holding elements 300 integrally in the wall 200.

[0082] Experimental studies have shown that more boundary conditions have to be taken into account when designing a module for the receiving side, i.e. a so-called reader ADL module, than when designing a module for the transmitting side, i.e. a so-called transponder ADL module. It has been shown that the following configurations can be particularly advantageous. For a reader ADL module, a simple piezoelectric component or a piezoelectric component bonded to a metal membrane can be used to construct a membrane, in particular an acoustic interface. The piezoelectric component can be contacted via a ring-shaped printed circuit board as part of an electrical connection element for an electrical connection.This ring-shaped circuit board can be spaced from the piezoelectric component by a silicon spacer to enable better decoupling and to reduce wave reflection at the edges. A wire connection with a silicon spacer can also be used. Another ring-shaped circuit board as another part of the electrical connection element, which is pre-filled with an acoustic decoupling element in the form of a damping mat, for example with or made of foam, is mounted on the first ring-shaped circuit board with the connected piezoelectric component. The purpose of these components is to prevent back reflection of air-coupled acoustic waves and to ensure a certain air gap behind the piezoelectric component in order to direct the maximum energy to the front.The circuit boards ensure the electrical connection to the piezoelectric component and can accommodate the acoustic decoupling element in a cavity or a complete opening in the other circuit board. If a cavity is used, it may be possible to mount a contact plug and / or other necessary electronic components directly on the back of this circuit board. Otherwise, a cover circuit board with a simple connector and / or embedded necessary electronics can be added regardless of the order of the previous steps. A housing body can then be placed over the entire assembly to protect it, improve mechanical stability, and offer solutions for integration into the desired application. A particular advantage here can be that the assembly can be optimized or replaced depending on the planned process.For a transponder ADL module, an acoustic interface can be provided with a piezoelectric component as described above. The piezoelectric component can be soldered onto a circuit board with two copper contacts, which can, for example, have a height of greater than or equal to 35 pm and less than or equal to 70 pm. This circuit board can contain a simple connector and / or any necessary embedded electronics to achieve a specific transponder function. For non-soldered contact points, a silicone ring can be added to increase mechanical stability and to seal the air gap behind the piezoelectric component. Depending on the application, a housing can be added. In the case of a communication system such as the communication system 1000 shown in Figure 11 described below, the transmitter and receiver sides can be designed accordingly.

[0083] Figure 11 shows a further exemplary embodiment of an electro-acoustic communication system 1000. The communication system 1000 has a cap-like housing body 1 with a plate element 10 having a first side 11 and a second side 12 opposite the first side 11, and with a sleeve element 13 arranged on the second side 12. The housing body 1 of the communication system 1000 can have features that were previously described in connection with the housing body 1 of the electro-acoustic module 1000. In particular, the housing body 1 of the communication system 1000 shown is a common housing body for two piezoelectric components 2, of which a first piezoelectric component 2 is fastened on the first side 11 to the plate element 10 by means of a connecting layer 3, and a second piezoelectric component 2 is fastened on the second side 12 to the plate element 10.The second piezoelectric component 2 on the second side 12 of the plate element 10 is surrounded by the sleeve element 13, which can have a thread 14 on the outside.

[0084] The two piezoelectric components 2 are aligned with one another, so that the piezoelectric components 2 are preferably arranged overlapping and congruently on the plate element 10. As indicated in Figure 11, a recess in which the first piezoelectric component 2 is arranged can be provided on the first side 11 of the plate element 10. This allows for better acoustic coupling of the first piezoelectric component 2 to the plate element 10.

[0085] The further structure on the first and second sides 11, 12 corresponds to the configurations described in connection with the module 100 of the previous exemplary embodiments. In particular, both piezoelectric components 2 can be connected to a respective electrical connection element 4. The electrical connection elements 4 and further features, for example relating to the acoustic decoupling material 5 and the acoustic absorber element 7, can be present and designed as described above. For mechanical stabilization, additional stabilizing elements 9 can be present, for example plastic elements in the form of frame elements or covers.

[0086] The communication system 1000 with the first and second piezoelectric components 2 on the common housing body 1 can be provided and configured, in particular, for insertion and fastening into an opening in a wall. Particularly preferably, the sleeve element 13 of the common housing body 1 can be screwed into a through-threaded hole in the wall with the thread 14. In particular, the housing body 1 can correspond to a screwable standard component.

[0087] The communication system 1000 can in particular have the following features: On the first side 11 of the plate element 10, an ADL link for the reader side, which can be a simple electro-acoustic transceiver or a complex element with embedded reading electronics and other necessary components such as batteries, etc. On the second side 12 of the plate element 10, an ADL link with or without transponder electronics, which can contain sensors or other application-specific components. An acoustic channel formed by the plate element 10 of the housing body 1, which ensures the transmission of the acoustic waves between the two sides. The housing body 1 is also used in particular to accommodate the components described and at the same time offers the necessary techniques for integration into an application, for example through the thread 14.Alternatively, a click mechanism, press-in, or other fastening methods are also possible. The housing body 1 can preferably be formed from a single metal part. Alternatively, the housing body 1 can also be formed from multiple metal structures, for example, to achieve greater mechanical stability and / or to enable operation in harsh environments.

[0088] The communication system 1000 shown can offer simple integration, easy interchangeability, and scalability in applications. It features optimally aligned piezoelectric components 2 with optimal mounting and protection for optimal performance. Regarding possible application sensors, the communication system 1000 can include different sensor variants for different applications, for example, standard sensors that require contact with the medium, simple communication, and a power connection, as well as embedded sensors, etc.The geometry and structure of the communication system 1000 can be adapted to the desired application and the sensor selection and can, for example, comprise a fully embedded module comprising the piezoelectric component 2 as well as transponder and other application-specific electronics, as well as an acoustic transceiver with electrical connections or a contact plug.

[0089] The communication system 1000 according to the embodiment of Figure 11 can, in particular, have one or more or all of the following advantages: Optimal alignment of the piezoelectric components 2 relative to one another. Optimally designed metal surface for the acoustic channel. Micro-assembly of the piezoelectric components 2 for optimal functionality and performance. Pre-assembly and protection of the piezoelectric components 2 and the embedded electronics.

[0090] The module 100 and the communication system 1000 according to the embodiments described here can provide ready-to-use and easily integrated solutions for industrial applications for power and data transmission through metal. In particular, the problem of micro-assembly at an industrial level can be solved by providing modules 100 or the communication system 1000, since a ready-to-use, fully assembled system can be provided using simple and standard integration techniques. Furthermore, a solution for possible assembly to achieve optimal performance when using NEC or RFID technology in combination with piezoelectric transceivers and solid-wave acoustic carriers can be enabled.

[0091] The features and exemplary embodiments described in conjunction with the figures can be combined with one another according to further exemplary embodiments, even if not all combinations are explicitly described. Furthermore, the exemplary embodiments described in conjunction with the figures can alternatively or additionally comprise further features according to the description in the general part.

[0092] The invention is not limited to the embodiments by the description thereof. Rather, the invention encompasses each new feature and each combination of features, which in particular includes each combination of features in the patent claims, even if this feature or combination itself is not explicitly mentioned in the

[0093] patent claims or embodiments.

[0094] Reference symbol list

[0095] 1 housing body

[0096] 2 piezoelectric component

[0097] 3 Connection layer

[0098] 4 electrical connection element

[0099] 5 acoustic decoupling material

[0100] 6 Potting material

[0101] 7 acoustic absorber element

[0102] 8 Connection layer

[0103] 9 Stabilizing element

[0104] 10 plate element

[0105] 11 first page

[0106] 12 second page

[0107] 13 Sleeve element

[0108] 14 threads

[0109] 15 Opening

[0110] 18 Connection layer

[0111] 41 electrical contact

[0112] 42 Deepening

[0113] 43 electrical component

[0114] 44 contact plugs

[0115] 100 electro-acoustic module

[0116] 200 wall

[0117] 300 holding element

[0118] 301 thread

[0119] 400 acoustic coupling medium

[0120] 500 connecting elements

[0121] 600 fixing element

[0122] 700 casting

[0123] 800 screw

[0124] 1000 electro-acoustic communication system

[0125] 2000 tools

Claims

Patent claims 1. Electro-acoustic module (100) comprising - a cap-like housing body (1) with a Plate element (10) having a first side (11) and a second side (12) opposite the first side (11) and having a sleeve element (13) arranged on the second side (12), - a piezoelectric component (2) which is arranged on the second side (12) is attached to the plate element (10) and surrounded by the sleeve element (13), - an electrical connection element (4) on a Plate element (10) facing away from the side of the piezoelectric component (2) to which the piezoelectric component (2) is electrically connected, wherein between at least a part of the piezoelectric component (2) and the electrical connection element (4) directly adjacent to the piezoelectric component (2) an intermediate space is formed which is filled with an acoustic decoupling material (5).

2. Electro-acoustic module (100) according to claim 1, wherein the acoustic decoupling material (5) is a gas.

3. Electro-acoustic module (100) according to one of the preceding claims, wherein an acoustic absorber element (7) is arranged on the electrical connection element (4) adjacent to the acoustic decoupling material (5).

4. Electro-acoustic module (100) according to claim 3, wherein the acoustic absorber element (7) comprises a porous material.

5. Electro-acoustic module (100) according to one of the preceding claims, wherein the piezoelectric component (2) is attached to electrical contacts (41) of the electrical connection element (4) and electrically connected.

6. Electro-acoustic module (100) according to one of the preceding claims, wherein the electrical connection element (4) comprises a printed circuit board.

7. Electro-acoustic module (100) according to one of the preceding claims, wherein the electrical connection element (4) has a recess (42) in which the acoustic decoupling material (5) is at least partially arranged.

8. Electro-acoustic module (100) according to one of the preceding claims, wherein the piezoelectric component (2) is attached to the plate element (10) by means of a connecting layer (3) with an adhesive.

9. Electro-acoustic module (100) according to one of the preceding claims, wherein the electrical connection element (4) has one or more electrical components (43) and / or a contact plug (44).

10. Electro-acoustic module (100) according to one of the preceding claims, wherein the piezoelectric component (2) and the electrical connection element (4) are fastened to the housing body (1) independently of one another.

11. Electro-acoustic module (100) according to one of the preceding claims, wherein the sleeve element (13) has a thread (14) on an outer side.

12. Electro-acoustic communication system (1000) for acoustic data and / or energy transmission through a wall (200), comprising - a first electro-acoustic module (100) according to one of the preceding claims, - a second electro-acoustic module (100) according to one of the preceding claims, wherein the first electro-acoustic module (100) is attached to a first side of the wall (200) and wherein the second electro-acoustic module (100) is attached to a second side of the wall (200) opposite the first side, wherein the first electro-acoustic module (100) is fastened to a first holding element (300) firmly connected to the wall, wherein the second electro-acoustic module (100) is fastened to a second holding element (300) firmly connected to the wall, wherein the first and second holding elements (300) are aligned with one another.

13. Electro-acoustic communication system (1000) according to claim 12, wherein the holding elements (300) are annular and concentrically aligned with each other.

14. Electro-acoustic communication system (1000) according to claim 12 or 13, wherein at least one of the Holding elements are attached to the wall by welding, gluing or screws.

15. Electro-acoustic communication system (1000) according to one of claims 12 to 14, wherein an acoustic coupling material (400) is arranged between the electro-acoustic modules (100) and the wall (200).

16. Electro-acoustic communication system (1000) according to one of claims 12 to 15, wherein the first electro-acoustic module (100) is screwed or clamped into the first holding element (300) and / or the second electro-acoustic module (100) is screwed or clamped into the second holding element (300).

17. Electro-acoustic communication system (1000) according to one of claims 12 to 16, wherein the first electro-acoustic module (100) together with the first holding element (300) and / or the second electro-acoustic module (100) together with the second holding element (300) is covered with a potting (700).

18. Electro-acoustic communication system (1000) for acoustic data and / or energy transmission through a wall (200), comprising - a cap-like housing body (1) with a plate element (10) having a first side (11) and a second side (12) opposite the first side (11) and with a sleeve element (13) arranged on the second side (12), - a first piezoelectric component (2) which is attached to the plate element (10) on the first side (11), and - a second piezoelectric component (2) which is fastened to the plate element (10) on the second side (12) and is surrounded by the sleeve element (13), wherein the first piezoelectric component (2) and the second piezoelectric component (2) are aligned with one another.

19. Electro-acoustic communication system (1000) according to claim 18, wherein each of the first and second components (2) is connected to a respective electrical connection element (4) and for each piezoelectric component (2) between at least a part of the piezoelectric component (2) and the electrical connection element (4) directly adjacent to the piezoelectric component (2) a gap is formed which is filled with an acoustic decoupling material (5).

20. Electro-acoustic communication system (1000) according to claim 18 or 19, wherein the sleeve element (13) has a thread (14) for screwing into a threaded hole in the wall (200).

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